Wall board jack dolly



April 8, 1958 Filed March 16', 1956 R. M. CALLAWAY WALL BOARD JACK DOLLY2 Sheets-Sheet l I N VEN TOR.

RobertMCaHaw/oy. I myfmr.

ATTO RNEYS April 8, 1958 R. M. CALL'AWAY 2,829,928

WALL BOARD JACK DOLLY Filed March 16, 1956 2 Sheets-Sheet 2 INVENTOR.Robert M. Call away ATTCI R N EYS United States Patent WALL BOARD JACKDOLLY Robert M. Callaway, Waco, Tex.

Application March 16, 1956, Serial No. 572,106

1 Claim. (Cl. 304-29) This invention relates to scaffolds particularlyof the folding or collapsible type, and in particular a plurality ofpivotally connected bars patterned to expand and contract, such as lazytongs, and a threaded rod extended across the bars and positioned todraw parts of the bars together to extend the height of the scaifold orspread the bars to retract the scaffold.

The purpose of this invention is to provide an adjustable portablescatiold for retaining wall board against framework of vertical wallsand also ceilings whereby the wall board is readily held in position fornailing and the like.

Various types of expanding and contracting devices have been providedfor applying wall board and the like, however, where screw jacks areused the parts are comparatively heavy and unless a jack is provided ateach corner comparatively complicated diagonal bracing is required. Withthis thought in mind this invention contemplates an adjustable frame inwhich the supporting elements include pivotally connected bars formed toresemble lazy tongs whereby with the bars drawn together the height ofthe device is extended and with the bars spread the upper end of thedevice is lowered.

The object of this invention is, therefore, to provide an adjustablescaffold for applying wall board to vertical walls and ceilings in whichthe elevation of the device is adapted to be adjusted as the scafiold isused. 7

Another object of the invention is to provide an adjustable scatfold forapplying wall board in which the parts are adapted to be secured inadjusted positions.

A further object of the invention is to provide an adjustable wall boardapplying scaflold in which the device is of a simple and economicalconstruction.

With these and other objects and advantages in view the inventionembodies an upper frame or head having depending vertically disposedlegs with spaced openings therein, pairs of vertically positionedcrossed bars pivotally mounted at one side on the head and positionedwith upper ends of upper bars slidably mounted on rails of the head, athreaded rod rotatably and pivotally mounted on a bar at one side of thedevice and threaded in a socket at the opposite side whereby uponrotation of the rod with a hand crank on one end the bars are drawntogether for elevating the head and wherein rotation of the rod in theopposite direction spreads the bars to lower the head.

Other features and advantages of the invention will appear from thefollowing description taken in connection with the drawings, wherein:

Figure 1 is a side elevational view showing the improved wall boardapplying scaffold with the parts in substantially collapsed positions.

Figure 2 is a side elevational view, similar to that shown in Fig. 1showing the scafiold with the bars of the lazy tongs drawn togetherwhereby the head of the scaffold is elevated.

Figure 3 is an end elevational view of the scalfold with the parts asshown in Fig. 2.

2,829,928 Patented Apr. 8, 1958 Figure 4 is a sectional plan through thescalfold taken on line 4-4 of Fig, 1 illustrating the mounting of thethreaded rods and also showing a wall board at one side of the scaifoldwith the wall board in position to be. applied to a vertical wallsurface.

Figure 5 is a vertical longitudinally disposed section taken on line 5-5of Fig. 4 with the parts shown on an enlarged scale illustrating themounting of one end of the threaded rod by which the scaffold isextended and retracted. v

Figure 6 is a vertical section taken on line 6-6 of Fig. 4 with theparts shown on an enlarged scale showing a threaded socket through whichan end of one of the threaded rods extends.

Referring now to the drawings wherein like reference characters denotecorresponding parts the improved wall board applying scaifold of thisinvention includes spaced parallel horizontally disposed rails 10 and 11channelshaped in cross section, vertically disposed supporting legs 12and 13 at one end and 14 and 15 at the opposite end depending from therails 10 and 11 and pivotally connected by rivets or pins 16 to innerflanges of the rails, upper cross bars 17 and 18 pivotally connectedwith pins 19 and the upper ends of the bars 17 are pivotally connectedto outer flanges of the rails 10 and 11 with pins 20, the lower ends ofthe bars 17 are pivotally connected by pins 21 to upper ends of bars 22,the lower ends of which are provided with casters 23 and, as shown inFig. 1, the upper ends of the bars 18 are slidably mounted on the rails10 and 11 and the lower ends pivotally connected with pins 24 to bars25, the lower ends of which are provided with casters 26, rods 27 and 28rotatably mounted on the bars 25 with bearings 29 and 30 and havingthreaded sections 31 and 32 on the ends opposite to the ends mounted inthe bearings 29 and 30 and the sections 31 and 32 are threaded insockets 33 and 34 on the ends of the bars 17. The ends of the bars 27and 28 opposite to the ends on which the threaded sections 31 and 32 arepositioned are provided with studs 35 and 36 having flat sides and onwhich a socket 37 of a hand lever 38 is positioned for manually rotatingthe rods.

As illustrated in Fig. 5 the rods 27 and 28 are provided with collars 39and 40 which are positioned on opposite sides of the bearings 29 and 30,respectively, whereby the rods are retained in longitudinally disposedpositions with the rods extended through openings 41 in horizontallydisposed flanges 42 of the bars 25.

Although each bar may be rotated independently it may be desired tosecure pulleys 43 and 44 on extended ends of the rods, such as with setscrews 45 and with a belt 46 trained over the pulleys both rods may berotated simultaneously.

The lower bars 22 and 25, which are positioned on both sides of thescaffold are pivotally connected with pins 47 and with upper ends of thebars 17 pivotally connected by the pins 20 to the outer flanges of therails 10 and 11 and with upper ends of the bars 18 slidably mounted onthe flanges of the rails 10 and 11 with clips 49 the bars, whichresemble lazy tongs are adapted to be contracted laterally by rotationof the rods 28 and 27 to draw the ends of the rods together and therebyextend the elevation of the scalfold from that shown in Fig. 1 to thatshown in Fig. 2.

With the parts designed and assembled as illustrated and described asheet of wall board, as indicated by the numeral 56 may be positionedupon the rails 10 and 11 with the frame or scaffold in the positionshown in Fig. l and upon rotation of the crank 38, with the rodsconnected by the belt 46, the ends of the bars are drawn toward thecenter from the position shown in Fig. 1 to that shown in Fig. 2 wherebythe wall board is elevated to a position against the floor joists orbeams of a ceiling so board to a vertical wall surface.

that the wall board may readily be nailed in position and as one sectionof wall board is secured in position the device is rolled longitudinallyor laterally to position an adjoining panel of wall board on the ceilingin the same manner. The device is readily lowered to receive a panel ofwall board or the like and with the wall board in position upon theupper end the crank is turned in the opposite direction, such as in aclockwise direction'to carry the wall board upwardly against the ceilingbeams or joists.

The legs 12 and 13 at one end and 14 and 15 at the opposite end providesupporting means for limiting down ward movement of the head or upperend of the frame whereby the device may be used as a stand with theparts in retracted positions.

The scaffold is also provided with a hanging side frame includingvertically disposed bars 51 and 52 with spaced openings 53 therein andthe lower ends of the bars 51 and 52 are connected with a transverselydisposed panel holding bar 54 upon which the lower edge of a section ofwall board rests when it is desired to secure wall The upper ends of thebars 51 and 52 are connected to outer flanges of the 'rail 10 with pins55 and 56 and spacing elements 57. The

elevation of the bar 54 is adjustable as the bar may be "secured bybolts or pins in the spaced openings 53 of the bars 51 and 52.

The socket 34 positioned on each of the bars 17 is provided with athreaded stud 57 which extends through an opening 58 in the vertical legof the bar 17 and the device is secured in position with a nut 59 thatis threaded 'on'the stud 57. The horizontal legs or flanges of the bars17 are also provided with slots 60 through which v the threaded sectionsof the rods 27 and 28 extend.

The bars 17 and 18 are reinforced with diagonal braces 61 and 62 whichare connected at the center with pins 63 and the bars 22 and 25 arereinforced with similar braces 64 and 65, the braces 64 and 65 beingconnected at the center with pins 66. The ends of the braces 61 and 62and 64 and 65 are connected to the bars 17 and 18, and 22 and 25, withpins, such as the pins 67.

With the parts assembled and operated in this manner wall board mayreadily be held in position upon vertical walls and ceilings as it issecured to the studding, beams and joists.

As a section or sheet of wall board is of comparatively light weight thestructural elements required in the jack or scaffold are ofcomparatively light weight so that the device may readily be collapsedand carried from one job to another.

It will be understood that modifications, within the scope of theappended claim, may be made in the design and arrangement of the partswithout departing from the spirit of the invention.

What is claimed is:

In a portable collapsible scaffold, the combination which comprisesspaced vertically disposed frames, each frame including pivotallyconnected diagonally disposed bars, horizontally positioned rails,pivotally connected at one end of the scaffold to upper ends of upperbars of the frames and slidably connected, at the opposite end of thescaffold to upper ends of upper bars of the frames, horizontallydisposed rods having threaded ends extended across the frames, said rodsbeing rotatably mounted in bearings on one of the bars at one of thesides of the frames and threaded in sockets on one of the bars at theopposite ends of the frames, means limiting longitudinal movement of thebars in the bearings whereby upon rotation of the rods the frames arecontracted and extended to elevate and lower the rails, verticallydisposed bars having a horizontal bar connecting lower ends thereofdepending from one of the rails at one side of the scaffold andpositioned to retain vertical panels of wall board in position fornailing, legs depending from the ends of the rails beyond the plane ofsaid horizontal bar, and casters on lower ends of lower bars of theframes.

References Cited in the file of this patent UNITED STATES PATENTS 78,302Mantey May 26, 1868 399,220 Timroth Mar. 5, 1889 682,932 Haltom Sept.17, 1901 740,398 CheveS Oct; 6, 1903 813,830 Robidoux Feb. 27, 19061,357,185 Powell Oct. 26, 1920 1,546,698 2011 et al. July 21, 19252,443,349 Foster June 15, 1948 2,465,206 Davis Mar. 22, 1949 2,468,230Pollard Apr. 26, 1949

